Output phase loss
Problem Output phase loss occurred.
Possible Causes What to Check and Suggested Measures
(1) Inverter output wires are
broken.
Measure the output current.
Î Replace the output wires.
(2) Wires for motor winding
are broken.
Measure the output current.
Î Replace the motor.
(3) The terminal screws for
inverter output were not
tight enough.
Check if any screws on the inverter output terminals have become
loose.
Î Tighten the terminal screws to the recommended torque.
(4) A single-phase motor
has been connected.
Î Single-phase motors cannot be used. Note that the
FRENIC-Multi only drives three-phase induction motors.
[ 6 ]
Heat sink overheat
Problem Temperature around heat sink rose.
Possible Causes What to Check and Suggested Measures
(1) Temperature around the
inverter exceeded that
of inverter
specifications.
Measure the temperature around the inverter.
Î Lower the temperature around the inverter (e.g., ventilate the
panel well).
Check if there is sufficient clearance around the inverter.
Î Increase the clearance.
(2) Air vent is blocked.
Check if the heat sink is not clogged.
Î Clean the heat sink.
Check the cumulative running time of the cooling fan. Refer to
Chapter 3, Section 3.4.6 "Reading maintenance information –
"Maintenance Information"."
Î Replace the cooling fan.
(3) Accumulated running
time of the cooling fan
exceeded the standard
period for replacement,
or the cooling fan
malfunctioned.
Visually check whether the cooling fan rotates abnormally.
Î Replace the cooling fan.
(4) Load was too heavy. Measure the output current.
Î Lighten the load (e.g. lighten the load before the overload
protection occurs using the overload early warning (E34). (In
winter, the load tends to increase.)
Î Decease the motor sound (carrier frequency) (F26).
Î Enable the overload prevention control (H70).
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